Hello, Daniel! I think I very much erred when trying to identify the error - the problem is a memory layout one, but a PCI related one.
The driver works on x86 because the PCI bus and the CPU physical addresses match - the Universe Master Window Base Register (LSI_BSx) is given the start address of the address range to map (the set of addresses on the PCI bus the Tundra Universe chip will try to answer to). In the driver the Universe is till now given the CPU physical address. But the Tundra Universe is a PCI device. All the addresses it sees need to be bus addresses, not CPU physical ones. This is - if I figured it out correctly - because of the host-to-PCI-bridge mapping. All physical addresses dereferenced by the CPU will correctly translate to their corresponding mapped PCI bus addresses because of the host bridge, but if you want the Universe chip to catch those addresses, it needs to have the bus address stored in its registers (the address matching the original physical address after the host-bridge translation). So I hope this can actually resolved by converting the address to a bus address and storing that. Doing this will keep the module portable, because the mapping would resolve to identity on x86, or at least I think so. I guess the correct new order would be: allocate_resource(&iomem_resource, ... ) to obtain a range of physical addresses, ioremap_nocache that physical start address to obtain virtual addresses for the ->virt pointer in the master window structure (now done in vme_master_window_map() I think), and then use virt_to_bus () to obtain the address to store in the master window base register. Then the driver should work both on (nearly) arbitrary setups for x86 and PPC. Of course I have to try that out first (I'm still home now), and let you know if that produced any results. Did VMIC run into similar problems when trying to run the driver module on the VMIVME7050 (750FX/GX IBM PowerPC board)? Because it is not yet in the list of supported boards? Thanks for the reply! With kind regards, Oliver Korpilla ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
